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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc3e1335c6206d1e0cbf46534b6c644d9bf4701993324524c5b482b973c8b31' 
  AND token = 'Lm59wU55plLcpoW5LWG7gi2SEPF9vqJ7oxR1GEtUEuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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