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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f537d870c08ecce18d48fdd4cf7931ecfc2e20d6e0cc5cfc8b997f8a7aad96a' 
  AND token = '67knuBhKz/tVdeEMtqIGexwv0YkUhUhkbIybdlIRjAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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