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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c05dc3936562704932db138a2d4e7cba7f91dee9fc62634b5e398a0d4a1b629' 
  AND token = 'r07wnIYVSA0emcpOcHQH4IfErt1m3wTrKXxKKHFYLVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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