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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd7dd9f6c815f332bfa6bcebb48d5c33eae3f67e6ab6e02d6c75149ce230a13' 
  AND token = 'yv9TDboq/C5R6U/qoiKXLDox38v0FNd33v0vkhV95as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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