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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30c3cb798f55ee7d7e05dbb18b00fbab75749daf833bb39ed99a52931144d6e' 
  AND token = '20HussbWQCBuf53NQLCCwMBvPUQElGsJSWePWArg+fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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