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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58465c84ce97d00e83fe89c0d1ddb98d16c022004ab42d3d9ae7b0186ad7e360' 
  AND token = 'p4f9unHQbuwpgDfhpOzFC0ZB5vwZka8cvi8vjS4eVTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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