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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710939af63ac05d13d3e52fd88313d131d01e3b440964e70be5d8aa609094f93' 
  AND token = 'eND2ZjfpA/o/iHpepnrii0dDRAil+/2/XRjoCpZV1Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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