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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee32267013db54899ad5ddecf87f08b96e0c093fbc17101a57395550ab68c51d' 
  AND token = 'PLW2jordSjtAem37lE1SdHdB+LZxA5OcQKPEvanvUNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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