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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a98bd7e37244745945cabad6a1e3cdd2ff141c65f20ec1ce39b54157a05f1d0' 
  AND token = '7HZ7h3Qq9zo0ag92TfjeXbmDDlzKI3f35HV9j+ie+wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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