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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27616770da359f6c842f205040c64f42af8db9ffd139cb4b9e6f8f8f0d4f2f4c' 
  AND token = 'Tvs3Z6E4YqJMxYY4g8iC+C7NsQpJggcMzI02LCHfJ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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