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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b97887e46cf0c5df9b0d549e557ec415c5d1e0e912609c2913d63b60ad3d7a' 
  AND token = 'Lt2DCF9eCvwUgcbOjBHH68dYfp6UAOgkEMJIwYkjaPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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