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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96708cddaeb0ede4d7c81c77183461814ebe7264629cd5aab5b949817d8e2fae' 
  AND token = 'sDMOMnYc/KTLQWiQ5S+ti3NVe2ttnIvjFV6WO1LC74E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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