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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e09fd88162cb8def0f34e6f7f223cb7f1c52deb61d8bdc93eccb3e570d1c2a' 
  AND token = 'fA4FftvHEGaMQmSit7z14RRpxxJCZrEJwGNDww2WWu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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