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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5198c30e2b9f7ed8914a290ec254c1c214b9795bfbfdbb044b0106d371dcbd8f' 
  AND token = 'LtRpQdZ3/qFnwkY9dMSX08yf8wpM2GhStbrNoWeh1HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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