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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c712d8e743076e71dfa17fb9a885d3180f5b18ad6e30e1d97467ed877e5abbe' 
  AND token = 'hsGoe3iJoRr4jQDTuAVPSA9RUfQMx84Osq/51wZTiqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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