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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66939f6c07bee3bafffe0067b8a89db3ba8235c5827acfc3a1f5317d11a36b1' 
  AND token = 'hTP8kkYnEeY31JpQKKtoA4Hk2nYOsN3qYw19inWeWwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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