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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf60e7fe25a60ee2bb3112a81ca21573dd8cae0e01379b6a8aae76c1a0945c' 
  AND token = '5Ar46C5RPno98bYZ+920yO/d6ALxYbLFsxdOr73W2Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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