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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ea99ddb2029061d5b8c7383f14c2a9286ea2c7674fabe2f2eec8a322d56164' 
  AND token = '+dowCxgQ/y04ieH2kA56hysohRgkSW65x9RUX9SHvZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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