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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953ab89d59379323cf2331140aa7c48e2f42cb0f988dc16cf4b9a3fe9dbac3a2' 
  AND token = 'ivLgHMOb/dF6S3c2oPGWS6S9YP3FnTr70xFawZ2NCDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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