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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231877c35a9248827eb4054374897550bb69205c5dd6550772880675a9be865c' 
  AND token = 'wY/cf1SgvDm8zIC4o7A3bwA4DHWsADOveQsGKzSt+Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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