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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d75364c438cde5e2c76f6166d636e7687b671fb3250e7c1b3d262a5510dd39' 
  AND token = 'spD+CoMo39n7V3MDIswCb/cgYUOVM8F5Z/6q30aeYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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