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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea53ceadb31fdf8a2f69c1f02bdad3aa2afa4c5ac46ecfc5c1132722df5a3673' 
  AND token = 'NHqA9hGi1gfzv21qgZpoWRNdQORK8iLdXs9PZIoSUu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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