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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a906b5b332836c191b0c8b04978ffe95b17adb5a9dae9702883a919164bbea89' 
  AND token = '3urHw0gsTZkabiJOeCN8RDHdazmSLfnt5Dxj/Wtcncw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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