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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfe955db0023238741974fac8e88629dd12fb2cd171602745aa850a8751522a' 
  AND token = 'oPpiF32hJRUvN+fnMI/eLRyilx30RW3ikp8xAGi5T7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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