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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e8d8b008de58d648872f4f94f22af6fb1a2f02386c4718069dcd70ee8f53a' 
  AND token = 'nc9zXI9y2PKtAezpZ6jbwxfs6rL67Ej9DvVKqElF9ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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