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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59173e14f127afc0ef15ed28ca474fecc62c471f27f723ad0c0f7acfb75a7946' 
  AND token = 'aWB7x3nu94AJWXyefPZu8YeaezQrLcreK8w/CtVI33k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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