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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26ff9a62a9ec9ef5f33c6b9fae61f7688b308c5cf9426a00efcea202e351fa4' 
  AND token = 'ObBildE2CcmP6lXC4PyLl/e2QZC1uQj9RqvLGDbef68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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