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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1145e2c5fc4fe423bb23bd21fc0df9ce220a039832c5ed11cc13440bbe719626' 
  AND token = '3IL3iVvsgK95Dh7rxtN2neZtvENntgqiTWsvR7a1j9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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