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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f76333f6f4fb4f739a65e5d1d74b5ed5623541ef142c7aa73ceacaaf61e02e6' 
  AND token = 'SOs8ZVnoWyV2KsSAHUpX7GsrcWlWJv6JWAou8/tV/LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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