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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8f12199a25b9ea76d037e2595e536cec5570ca9f7468c7ab8dcfa24fc6d831' 
  AND token = 'n18/KGgB3Oew1cB70pcDigY/TtEbZKbaS5/YTAF+fFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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