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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10773fa4404978aa52675334df0c365a6993dc18a5d4cb18010be052e09ee93f' 
  AND token = '4shiZI+m9Hk5y5xTR/I0V4mbqjWDaSpMf0e79H0HDQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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