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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff7ef2c3022cbf8dd6ed07a6c8013870b57adb648f25ea9076ed6ba4fb7e182' 
  AND token = 'HBf82xdL8wMDJ441nosU+AoeB1dhjUded+hKJi93+Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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