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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ba1210f2444dd224a4c6c10e792927f62d7479215fe02e689d340f782f05c9' 
  AND token = '629b1p/zdZRFxkFZsZp2iXsi0H1yPYPG88GJzrx0rNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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