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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c72b26fedb06ee85deed0800e398e34c28bde99d3a7538fefd75338ea1632a' 
  AND token = 'HJHGv9ZTpEdIhKQr4JfHn+LoFj4sJ4zuipMeH3NAyLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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