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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548d7f47511a6eefeebf1907cc414cef8f3dd344ae7a5ef3c52d1cc99a0ac7b2' 
  AND token = 'cI84amzF+XDQibm/XZDoouzGslOaDrEjmduCdfhtNKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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