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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef38865a5b03444ad64779929fdbb6b1dbbe764155b6afdcd786119e5bc9a81' 
  AND token = '1pBLOx3cr6uJySXZJhRDG+0xv6keovF4Ov3bqLiY4Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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