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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26603d9504dbbe43615db5728c5f298ee26d9e14e4c461438feb0b34bb60e178' 
  AND token = 'VrLFB7Y4QzfdyLhQosvo/D5KlpJrD9Hy3q/mcvr40cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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