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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cc56b25578d2da6ee68dbee7f2f9a6bcf42b674b1f9c1aeb266bb05a737164' 
  AND token = '9m8Q41pzzl6zIqmvcKe+dNCZS1Irrl0aWWVIFwer8+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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