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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae6d1d5569b11d1da6fcf43d2fb29f7b953a0b3bbbe7eee135991f76464bfb' 
  AND token = '0Acd8IwCXapvyWx4yP+3VKqcg7idDs3CKT0ovV7iJUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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