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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bac3a978c68a1de064b30e9f2e2becf7271ff900ea565d941d41fd21954522' 
  AND token = 'LPi6MTY3SyMsECDSKULXCaDS2WYhdF0V5q1eBARwHrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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