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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eccf735aca9b5126c73ca65f4e24e29adfce9ef3a3ccb6ecee89adefadc976' 
  AND token = '5E9U0nk4C/TF6k3/AkSKT2kYE63NWojUTw6oC4Q8CDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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