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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb98bc6f047d5c0e89eaa1a735bda816108adc67bbc6097c2b6618a97dd7024e' 
  AND token = '2Q4v2NsXlo8Cpc1Ll4DVaHSLEU2nf5BsgZhFc7Ux4iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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