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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0887567db8358ca02e8e338101b78f21ef47508a58dee6208a09c9647a10a1b9' 
  AND token = 'DIxC4V05F8/GodvQv6DmpJb/uDkX1S+PsOVR04/RUHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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