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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962a07e3428845853eb2e987ccf74b9153a28642803ec654e12dcca6cafc5410' 
  AND token = 'bYL0f1xlz5gQmXeVeiARSi7YOlA84Q9wyuqwEh01VA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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