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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d0cc0bb06b9abd5673c89b16feab71bf4a333cd0fde83e677bf9c9370a565e' 
  AND token = 'Gs+xVKOwB69dC/eABudfiQOTFxEgQ++QNkBLoQUoXeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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