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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4814a71be625e07815f4a1a079318fe7845239e1090f115c85ae8b789723bb91' 
  AND token = 'IMbzJAy0xIQ/K1B+UQUa7cifs135giSQ1s7DQhgj9Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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