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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c474afd80d64793c301bd2a634c01a0ef390d28faef9f276c4f4b0ead5bb7b' 
  AND token = 'H+X2+eXz1Ya9ozX3boa5SBcGmytwQ5Qbba7XQEzos30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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