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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b6e15385ab24bd2572fbfaa112c785b54bfdf2448eb69e0a5f8114097ff0e3' 
  AND token = 'W2v5e0qYgZooOt98qtvX4ScmoIVms8b2a/PHZn307U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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