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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaee42bc36e0ed431acf16955a98efaaf6df5739811d4c6f58d21d5c42af449d' 
  AND token = 'ZYVp/5k8OaWaGKIOtLgcYbf+rEViEH9MPohjEqykGvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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