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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431539753bc2f59effd9e047b8f1e10adb50592576649f00f45355cf6db1276c' 
  AND token = 'eI+lRHrX9XD8SrvkMiVLNIOt1UlXlcKVRIBcF2tbC/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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