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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0972b11ef6ebe2ec4ba8b7d9e054345efbabe96fa3197195b65a037f4716f8f0' 
  AND token = 'rgmi2E67NPWDcY1FGM1tMshlceDH2wyRxzVm5NwDIHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}