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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed634b45f81c073ec6803d8c070e29d7bcd1c54fb87805305c00eba7b0bf5eb' 
  AND token = 'Q27GB5vnIAF/a8N7C1H3o5IsS1Z483mWju1JMVZ6DW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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