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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce56c7e16081a80be523785b609bb8823281ec04eaf4ed399d6a8de5120a5ac9' 
  AND token = 'eLaHZKWalKBWhZ7ttky/4cgFpSNO+TlIuDAU+0bAus8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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