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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be372b6378527e69f724264810a0bc58eb02c67010b6b7e17fd9a74ae99ee57' 
  AND token = 'P9p8EOXBp+mgQMMfvn39ICasy5bEzUg7hBg+4WcXmyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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