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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98937dd2fd19df0d4ea8012042ff912e5a3bbe08bb41bb89ce8258d2986483ee' 
  AND token = 'RQvfekBDk+jK+fGXaw4QbAHDqHdmvvt7B/WWky+776Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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