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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64f8983fd0c4d69e16a95a3f5de7976509dae288e869a8cfa6399d0e2bb6744' 
  AND token = 'N/O3quNkdU/oLa3AqIlNNkIOp2Ys5UpRogUFpVbRJ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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